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Push the 'OSD' ("On Screen Display") button on the bottom-edge of the monitor.
Use the LEFT/RIGHT buttons to select BRIGHTNESS or CONTRAST.
Use the OK button to choose that selection.
Use the LEFT/RIGHT buttons to decrease/increase the BRIGHTNESS.
Use the OK button to confirm the setting.
Use the LEFT/RIGHT buttons to select CONTRAST.
Use the OK button to choose that selection.
Use the LEFT/RIGHT buttons to decrease/increase the CONTRAST.
Use the OK button to confirm the setting.
Push the 'OSD' button to exit from the OSD.

Press the OSD button to show the On Screen Display.
Press the UP/DOWN or LEFT/RIGHT buttons to move through the various menu-items.
When you get to the correct item, press OK to select that item.
Then, use UP/DOWN or LEFT/RIGHT buttons to adjust.
Press OK to "accept" the adjustments.
Wait a few seconds, and the OSD will vanish.

Push the button on the front that says menu. Within that menu you will find the brightness control. Use the other buttons to move through the different menu items until you get to Brightness. Once there push the menu button again and then adjust the brightness with the other buttons.

The problem seems to be that the computer, do not recognize “which monitor’s connected?”Follow these steps to correct the problem: Shutdown the monitor, next shutdown the computer.“Unplug” the monitor, from the power outlet. Disconnect all cables on the Monitor from the computer.Next, reconnect all cables, and power, in the reverse order. Start computer first! Turn on the monitor, (right) click on an empty area of your Desktop Screen;next click Personalize, click Display Settings, click Identify Monitor.At this point, the monitor should be present, click on monitor. To finalize the application, click Apply! Next, click (OK).To “Fix” the (Resolution): Part: (1) Click Display Settings, adjust “resolution.” Click, Advanced Settings, “click” Properties, click on Drivers, “click” Update Drivers; click “OK!” Part: (2) Right click on “Desktop”, (in the upper area) check if the Graphic ™ Control Center is visibly presents, if so, click to open.You can adjust the Graphic Settings. Click “Apply” next, “OK” when finished! Restart the computer.I hope this Fix it.